Dagobah is a fictional planet in Star Wars: The Empire Strikes Back and Star Wars: Return of the Jedi. It also appears in a deleted scene from Star Wars: Revenge of the Sith.
Dagobah, in the Sluis sector, is a world of murky swamps, steaming bayous and petrified gnarltree forests. The ubiquitous white spiders that roam the swamps are actually newly-sprouted seedlings of the gnarltrees that will take root and grow.
The planet's fauna was comprised of creatures such as Pikobis, Sleen lizards, Elephoths, Dagobah pythons, Butcher bugs, Bogwings, Vine snakes, and Swamp Slugs. Ruling over them all was the Dragonsnake, the giant alpha predator of the swamps.
Jedi Master Yoda went into exile on Dagobah after the fall of the Galactic Republic and the destruction of the Jedi Order. Twenty-two years later, He trained Luke Skywalker in the ways of the Jedi.